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I write software for various hardware devices. Finding bugs, and resolving them is usually relatively easy if the issue can be replicated in a test environment with development hardware and full logging equipment setup. The problem however is when:. I recently faced this issue. I tried a few options including blindly guessing at what the issue could be and implementing fixes for various possible issues, next tried working with the network operator which got nowhere.
The OpenLog was a perfect fit since it:.
There were a few steps involved in the process including, connecting the OpenLog to the device, building a programming cable for the OpenLog, and customising the OpenLog software to emulate the initialisation string of the Windows software tool. A 5 or 6 way header soldered to all logger pins could just be used but I thought this approach best to avoid any mistakes broken loggers llp2950acz that way there is a x4 way header to use when plugging into the printer and you are not left wondering which 4 pins should be connected.
Modify the FTDI cable such that it has the following pinout compatible with logger. Use a flat screw driver to release the pins from the existing socket. In terms of hardware the system is comprised of:.
,p2950acz chose to install the relay box it in parallel with the existing timer clock. In terms of mounting the relay PCB in the box I chose to use to use some nuts and bolts, hot gluing dztasheet bolt to the base. I also put some small rubber feet on the board to keep it more secure.
This allows the relay board to still be removed from the box if required at a later stage. I secured cables going into the boxes with cable ties one on the outside and one on the insidenot the most professional solution but having used various cable grips before none of which seemed particularly secure prone to popping out againand lp295a0cz time consuming to fit therefore this time I opted for a simpler solution.
The control box had limited space this meant things fit nicely without moving but I also used some stick on cable holders to lp2950zcz the PCB steady, and placed a blank PCB in the box to separate the switches from the Synapse Evaluation board preventing the possibility of shorts.
LM Datasheet. Www.s National
I used a standard labeller with stick on labels for marking controls on the box, this did not lead to as professional a finish as I would have liked however I could not immediately think of a better options without paying out for a possibly costly custom enclosure. Getting the Fox G20 out of the box I was immediately very impressed with it and was able to get up and running within minutes, only thing that was not immediately clear was the root password netusg20 but this was quickly located after a search of the wiki.
PHP Schedule Application inc. The Python script on the Synapse RF Engine simple connects the serial port to the transparent wireless connection. In an addition to my original Doorbell Control projectalong with software based notification of events I put together a portable, battery operated unit as well. The unit operates from two AA batteries and features:.
If the doorbell is rung, the bell sends a multicast RPC call which is picked up by the unit. One of the green LEDs is then turned on. Wavetrend has various hardware available including tags suitable for mounting on metal, plastic, personnel, and keyfobs with buttons.
Tags also support RSSI such that it is possible to determine approximately how close a tag is to a reader. On the software side the serial data from the RX could just be transparently forwarded to a server for processing, however if you have only a small number of tags, and are looking to trigger events on other nodes without depending on an external server processing the data in the middle the better option is to parse the tag data on the Synapse Engine itself. See below for sample code to parse data from a Wavetrend RX reader and send logEvent RPCs to Portal event log code can be replaced by your own code to e.
Python code should also be easily adaptable for use on non Synapse hardware. Wavetrend L-RX Parser ]. It is useful if you have e. After testing the device I found it worked in terms of passing through earphone audio but not in terms of passing through the microphone. Further testing with a multimeter showed that the 4th ring sleeve which is the microphone connection was not passed through.
Since the microphone is the sleeve connection the only one easily accessible on the socket I was able to run a wire down the side of the case from the top socket to the 4th ring on the plug, solder it in place, and finish it off with some heat proof tubing. It seems to work fine in terms of fixing the microphone problem.
I also purchased the iFrogz Fritz Headphone Adapter which had the same problem as the EX in terms of the microphone connection not being wired through.
In the second part of my original Doorbell Control project I wrote some software to handle notifications for the doorbell being pressed in C.
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For the initial stage I chose to keep things simple and provide notifications voice announcements via the intercom feature of an existing SIP phone network running Asterisk open source PBX software with Cisco phones rather than going for a hardware approach. It is the provided primarily for those with C knowledge looking to complete similar projects. We have a fairly standard hard wired, 8V AC mains adapter powered push button doorbell.
However due to some shortcomings I recently decided to upgrade it to provide additional capabilities but keeping the existing circuit as much as possible. Due to space limitations only the circuit for the bottom MOSFET is shown, the other however is just a duplicate of the first, also see above for closeup diagram of the relay control part of the circuit.
The pin spacing of the relay PCB terminals did not match that of my stipboard therefore I chose the non standard approach of soldering wires to the terminals and zip tying the relays to the board. Future projects will handle the other end of the system, i. I was initially looking into off the shelf hardware, however was unable to find any readily available equipment to the hobbyist market in low quantities that was reasonably priced, and fit the requirements. Therefore partly as a personal project, and partly in preparation for a possible commercial product I decided to put together a prototype active RFID tracking System.
The solution I came up with is based on 3 main hardware components, and 5 software components. It utilises mesh networking meaning that only a single reader needs to be physically connected to a PC, all other readers just require power. The main hardware component used is the Synapse RF Enginea 2. Video showing simulation of tracking between 8 rooms, using 5 tags.
For real life demo showing a single tag moving between 3 rooms see below. The system was originally designed around the principle of Trilateration. As long as a tag is within range of at least 3 reader nodes the tags position can be calculated by using the signal strength of the tag to each of the 3 nearest readers. However this approach turned out not to be very feasible since past around 2 meters the signal strength started fluctuating in a seemingly unpredictable way. This now means that readers need to be placed in each room ideally centrally where tags need to be tracked and it is only possible to determine a tag is in a room, and not its position in that room although it is not used the original trilateration code has been left in the download.
Using a two part system of sending the tag data to a web server via a locally run data forwarding application then displaying it back to clients in the browser has a number of advantages:. The use of mesh networking means that only a single device needs to be directly connected to a PC, all the others just need to be within range of any other unit that itself is either close to the PC, or close to another reader that is close to the PC.
The nodes just require 3V power. I used a CR battery from Rapid however both Farnel, and Future also have a selection available from various manufacturers. I choose the Teko Enclosure because of its compact, credit card size. Unfortunately however this meant that the RF Engine would not fit vertically inside.
I therefore decided to bend over the pins, allowing one side to be plugged into the evaluation board as normal albeit it a much looser fit and the other to be plugged into the IDC header via an extension cable.
I tried a number of approaches to bending over the pins, including bending them all at once using pliers, and trying to bend them against a flat surface, neither proved very fruitful.
In the end I found the best approach was individually bend each using the tip of the pliers. I also used some heat shrink tubing to tidy things up.
To secure the module in the enclosure I used two small stick on feet on the module itself, and two larger stick on feet to wedge the battery holder into a corner of the enclosure.
A better approach if such parts exist would have been to purchase connectors that can mount directly to ribbon cable therefore requiring no solderingand to purchase suitable sized ribbon cable to fit. If you are going to use the same approach I did and solder the connections then ensure the solder does not leak into the socket, otherwise it will not be possible to plug it in to the evaluation board.
As with the tags in terms of wiring, the reader nodes are fairly straight forward, with pins 21 and 24 going to the appropriate connections on the DC plug. The other small mounting stand served to secure the module in the box with one row of pins on the module fitting between it and the outer case wall.
After the module and DC plug were fitted inside the box some space remained between the top of the module and the top of the box, therefore I used a single packing peanut to secure things. Something like hot glue could also be used however the packing peanut means the modules can quickly and easily be removed and put back into the box, e.
If you are looking for additional range the Dxtasheet RFPC6 including a transmit amplifier or RFPD6 including a transmit amplifier and allowing connector of an external antenna may be more suitable for the both the PC reader, and reader nodes.
To simplify the process of linking the 3V Synapse module to the PC i. Specifying a TTL of 1 on the multicast RPC call causes only readers that are directly in range of the tag to receive the ping, otherwise by default any nodes not in direct range of the tag would be forwarded the call from readers that were.
This would lp2950cz it would not be possible lp2950ac work out pl2950acz reader actually communicated with the tag satasheet and which communicated 2nd hand. The reader node Python software is responsible for receiving a multicast ping from the tag, and then forwarding it back to the module connected to the PC, along with the signal strength of the tag that sent the ping, and the id of the reader itself.
Thanks to the SNAP Synapse Network Appliance protocol datadheet intricacies usually involved with using a mesh network are all abstracted away from the programmer meaning it can be done in only 2 lines of code excluding comments, variables. The PC Reader Python software handles receiving data from the reader nodes which themselves receive data from tags. The software prints the tag ping data to the serial port after decoding the hex values to plain text. If the tag that sent the ping is in range dafasheet e.
It does not simply pass data straight through to the web API however does some initial processing, firstly in order to minimise HTTP requests improve performanceand secondly in order to group tag pings together based on a 1 pl2950acz time limit something that would be otherwise unnecessarily complex to do on the web application side. It is assumed a tag is in the same location when any reader reports seeing that particular tag within a 1 second window from when the tag was first seen by any reader.
However this does bring with it lp295acz licensing costs if you use over 6 modules on a network at a time lp2950aca Portal. Therefore I coded a custom client side data forwarding application, rather than loading a Python script into Portal to do this and using RPC calls which would have been a simpler solution. C Source Application Executable ].
Coded in PHP this part of the code is responsible for accepting data from the HTTP Data Forwarder, converting the signal data into a location on a map, saving the data to a MySQL database and displaying it to one of more users viewing the map. When the map is first loaded the tags will animate from their last 2 positions coming to rest at the current live location.
Lp2950acz datasheet pdf
Video showing a single tag moving around the map plan diagram corresponding to its real world location in one of 3 rooms. The tag ping interval was set to 3 seconds.
Video showing failed attempt to use trilateration to determine the unknown position of tag datadheet the known position of 3 readers, and signal strengths to them. Synapse Wireless software, and documentation is available from the Synapse forum. If you are interested in this project you may find these others also of interest: Parallel Tracka free for personal non commercial use server side vehicle tracking application coded in PHP designed to be used with Python supporting Telit hardware modules running the embedded TModSoft software firmware.
Nicholas Lp29950acz Freelance website and web application developer. The problem however is when: